The travel funds aren't always available to go to conferences, but at least most of the sessions from the regional and national WordPress conferences (aka WordCamps) are posted online. I will occasionally repost some of the germane ones here. Presentation slides are after the break.

The first four minutes do not apply to a multisite blog, so you can skip ahead.

In this first one, Hanni Ross from Automattic talks about the "Top 5 Ways to Break Your Blog – and Fix It" (21:32)